1872809164789 has 2 divisors, whose sum is σ = 1872809164790. Its totient is φ = 1872809164788.

The previous prime is 1872809164783. The next prime is 1872809164799. The reversal of 1872809164789 is 9874619082781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1758960282564 + 113848882225 = 1326258^2 + 337415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872809164789 - 2¹⁵ = 1872809132021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1872809164783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936404582394 + 936404582395.

It is an arithmetic number, because the mean of its divisors is an integer number (936404582395).

Almost surely, 2^{1872809164789} is an apocalyptic number.

It is an amenable number.

1872809164789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872809164789 is an equidigital number, since it uses as much as digits as its factorization.

1872809164789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97542144, while the sum is 70.

The spelling of 1872809164789 in words is "one trillion, eight hundred seventy-two billion, eight hundred nine million, one hundred sixty-four thousand, seven hundred eighty-nine".